ADE5169 datasheet(29/148 Pages) AD

29 / 148 page

ADE5166/ADE5169

Rev. 0 | Page 29 of 148

SAG Monitor PSM Interrupt

The ADE5166/ADE5169 energy measurement DSP monitors

the ac voltage input at the VP and VN input pins. The SAGLVL

voltage SAG event. The FSAG bit in the power management

interrupt flag SFR (IPSMF, Address 0xF8) is set if the line voltage

stays below the level set in the SAGLVL register for the number

of line cycles set in the SAGCYC register (Address 0x13). See

the Line Voltage SAG Detection section for more information.

Setting the ESAG bit in the power management interrupt enable

SFR (IPSME, Address 0xEC) enables this event to generate a

PSM interrupt.

USING THE POWER SUPPLY FEATURES

In an energy meter application, the 3.3 V power supply (VDD)

is typically generated from the ac line voltage and regulated to

3.3 V by a voltage regulator IC. The preregulated dc voltage,

typically 5 V to 12 V, can be connected to VDCIN through a

resistor divider. A 3.6 V battery can be connected to VBAT.

Figure 32 shows how the ADE5166/ADE5169 power supply

inputs are set up in this application.

Figure 33 shows the sequence of events that occurs if the main

power supply generated by the PSU starts to fail in the power

meter application shown in Figure 32. The SAG detection can

provide the earliest warning of a potential problem on VDD.

When a SAG event occurs, user code can be configured to back

up data and prepare for battery switchover, if desired. The rela-

tive spacing of these interrupts depends on the design of the

power supply.

Figure 34 shows the sequence of events that occurs if the main

power supply starts to fail in the power meter application shown

in Figure 32, with battery switchover on low VDCIN or low VDD

enabled.

Finally, the transition between VDD and VBAT and the different

power supply modes (see the Operating Modes section) are

represented in Figure 35 and Figure 36.

VOLTAGE

SUPERVISORY

POWER SUPPLY

MANAGEMENT

IPSMF SFR

(ADDR. 0xF8)

VBAT

VSW

VSWOUT

VDD

VOLTAGE

SUPERVISORY

VDCIN

3.3V

REGULATOR

5V TO 12V DC

PSU

SAG

DETECTION

BCTRL

(240V, 220V, 110V TYPICAL)

AC INPUT

Figure 32. Power Supply Management for Energy Meter Application

Table 26. Power Supply Event Timing Operating Modes

Parameter

Time

Description

10 ns min

Time between when VDCIN goes below 1.2 V and when FVDCIN is raised.

10 ns min

Time between when VDD falls below 2.75 V and when battery switchover occurs.

30 ms typ

Time between when VDCIN falls below 1.2 V and when battery switchover occurs if VDCIN is enabled to cause

battery switchover.

130 ms typ

Time between when power supply restore conditions are met (VDCIN above 1.2 V and VDD above 2.75 V if

BATPR[1:0] = 0b01 or VDD above 2.75 V if BATPR[1:0] = 0b00) and when VSWOUT switches to VDD.

ADE5169 データシート(PDF) 29 Page - Analog Devices

ADE5169 データシート(HTML) 29 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

データシートダウンロード